Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d57f961580cf9af…

MALICIOUS

PDF

89.5 KB Created: 2021-09-04 21:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70e9e9f2a9028db8a98a75dab18307be SHA-1: 20c04b14e3c4f4b041e1f54a599db4de12722090 SHA-256: 9d57f961580cf9af77a2b798c31dc6f09917045aa186b16cfd0ed0cf9628f817
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file exhibits characteristics of a phishing lure, specifically prompting the user to install a browser extension or update to view content. This is supported by the 'SE_BROWSER_INSTALL_LURE' heuristic. The numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggest an attempt to distribute malicious content or redirect users to phishing sites. ClamAV detection further confirms its malicious nature, identifying it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=fax+cover+sheet+pdf+filler PDF link annotation
    • http://parentini.it/userfiles/files/kupukoge.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/sopumupav.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075d93059d3a---wiser.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b7545009---62715353561.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a25e2e3c---92297232214.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607063f986a08---55920780549.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bcbe19c27f5f15c46ae753aa22dc68b9/9565999440.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/vitulavororarulirup.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///zudunoladajuw.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/64o1fmo7u975hucljpkf1pps45/31687762763.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/xupuwutukaz.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/gabodunevusiwejuz.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610d84005f1a6---70195589929.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9081a4831---jemeko.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/24970027245.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/57104994685.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/10951e0f7734d92aca41798593f0af22/11949367213.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/tidelojuboj.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1d25893f1---roweroxidexinamujejija.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b30892741d9---tebopovulusexo.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/subufosuke.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61f70ae21---96427412603.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/d3bee6d225d23c0a2abc1bfc22e281f6/rorazetixawazoxawapo.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ca2806268f63cc5f0a976494488ee651/jekop.pdfIn PDF document text
    • https://ibextrail.com/editor-images/52185692389.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/nodepetegumalozenetew.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/c6f2r1djh5gn0l2s5ic2mn78g9/76130073351.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 10760 bytes
SHA-256: 1b3ed9134c6dbcca37f6acf75fb948d776c2edb79fd1ad1df2067102401f9ba4
font_02_sfnt_off000129cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 17876 bytes
SHA-256: 30c43a3bf7c5374972caa0e52c5f93ae3d897f00d9df43ba76d0dc72b4a33cd7

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